import time
incomplete_sign = 50  # .的数量
print( '='*23+'开始下载'+'='*25)
for i in range(incomplete_sign + 1):
  completed = "*" * i #表示已完成
  incomplete = "." * (incomplete_sign - i) #表示未完成
  percentage = (i / incomplete_sign) *100 #百分比
print( "\r{:.0f}%[{}{}]".format(percentage, completed,incomplete), end="")
time.sleep(0.5)
print( "\n" + '='*23+'下载完成'+'='*25)